Lamp-socket.



V. G. APPLE.

LAMP SOCKET.

APPLICATION FILED APR. s, 1914.

' Patented Sept. 8, 1914.

STATES' VNCENT G. APPLE,

narnnr anion F DAYTON, OHIO, A 'CORPORATION 0F OHIO.

LAMP-SOCKET.

, To all whom it may concern Be it known that l, VINCENT G. Arran, a citizen et the United States, residing at Dayton, in the county of Montgomery and State ot Ohio, have invented certain new and useful Improvements in Lamp-Sockets,

of which the following is a specification.

This invention relates to improvements in sockets for incandescent electric lamps.

My improved socket is `particularly adapted for use with the lighting systems ot motor cars, where the apparatusis subjected to great hardships as compared with house lighting systems or the like, where there is no vibration and the socket is protected from theelements. V

Motor car lighting systems are frequently installed by workmen and used by persons unfamiliarwith electrical matters and one of the objects of my invention is to provide a. socket that is practically tool-proof and can be installed without the an accidental ground. n

Another object of my invention to provide a hardy, eiiieientsocket, easily manufactured without requiring the use of special tools other than those ordinarily found in a shop where electrical apparatus is produced.

Another object of my invention is the provision of a socket in which the two currentcarrying wires are led into the base from the rear end thereotand are readily connected to the lamp terminals from the outside ot` the socket by solderinfT or` the like.

@ther and further objects of the. invention will be apparent to those skilled inthe art from a considerationof the following specification and drawings in which;

Figure 1 is an elevation of my improved socket showing a lamp inserted therein. Fig. 2 is a vertical sectional view through the socket. Fig. 3 is an elevation off. a lamp showing one form of base particularly adapted for use with my improved socket Fig. l is an enlarged transverse sectional view on the line 1 -4 of Fig. 2. Fig. 5 is an enlarged transverse sectional view on the line 5--5 of FigjQ. Fig. 6 is a similar transverse sectional view on the Fig, 2. Fig. 7 is a similar transverse sectional view on the line 77 of Figf 2. Fig.

8 is an enlarged vertical sectional view through the central contact plunger, and. Fig. 9 is an enlarged perspective view show- Speccation of Letters Patent. Application filed April 8.,

liability' of Patented sept. s, 1914.'

191s. Serial No. 830,370.

ing the terminal plate to which the central contact is connected.

The numeral 10 indicites a cylindrical base part made of fiber, bakalite, or other readily moldable insulating materfal. This base part is of two diameters, the part 11 which receives a contact cylinder 12 and insulating sheath 13 being reduced in diameter twice the thickness of the two coverings so that when the socket is completed, and the insulating sheath in place, the entire structure is of a uniform diameter lequal to the diameter of the larger portion of the base part 10. i

The metallic contact cylinder 1Q makes a tight tit over the reduced portion 11 of the insulating base part and projects beyond the end of the base sui'llciently t'ar toreceive the base part 1i of an incandescent lamp. In the particular embodiment of my invention illustrated l have shown the socket aso-f the Ediswan type, the projecting pins 15 on the lamp basepassing into the slots 16 formed in the cylinder 12 and on partial rotation' thereof engaging with the oH-set'passages 17,"of this bayonet-engaging member.

A metal plug 18 is pressed into a central opening in the inner end of the base extension 11 and is bored out as at 19 to receive a spring Q0, and plunger 21. The plunger is centrally bored, as at 29, and is provided with an annular. shoulder Q3 at its inner end so that after being inserted in position the outer end ot' the plug 1S is turned over in- 'ardly as at Qt and the spring pressed plunger thus held in position. rlhis phmger 21 terms a yielding central contact for the button 25 on the center ot the lamp base.

A substantially square opening 26 is provided by cutting away from the cylinder 12, a part ot' its inner end thus exposing a portion of the insulated base part. 11. A metal plate 27 curved to conform to the cylinder 1Q and of a size somewhat less than the opening 26 overlies the exposed part'of the base '11. This plate Q7 is provided with a pin 2S. radially disposed with respect to the arc of the plate, and of a length suicient to extend through an opening in the base 10 and into a hole Q9 provided therefor in the of a loop, a recess or slot 30 being formedin the base 11 to receive the loop. The wire can f "thus be inserted between the plate 27 and the loop 30 and securedin place by solder 31. A similar loop 32 is formed in the cylinder 12 at the side positioned opposite from the plate 27, a recess 32 being cut in the base to receive it. Obviously the loop 32 must be formed after the cylinder 12 is, in position. This is accomplished by pressing the ribbon, formed by the two parallel cuts, into the recess 32. Holes 33 and 34 are formed in the base member 10 and positioned to 'register with the openings formed between the loops 30 and 32 and their respective parts. The openings 33-34' are enlarged at their outer end as at 35 and 36 to receive the insulated ends 37 and 38 of the two wires 39 and 40. After Athe wires 39 and 40 haveybeen insert- 'ed in the insulating base and securedly soldered in place, an insulating sheath 13, of fiber or the like, is placed over the cylindri cal metal part 12, thus insulating the entire# socket. And as the outside diameter of the sheath 13 is the same as the outer diameter of the base 10 a smooth exterior surface is provided.

A pin 4l extends through the sheath 13, the metal cylinder 12and into the base part 11, at a point intermediate the terminal connections, thereby lockin the sheath land metal parts in place. Vhereas the pin 41 serves to lock the cylinder against accidental displacement it is evident that an additional lock is formed by the bending inward of the loop 32 into the recess 32 in the base 11.

4Having described my invention, what I claim 1s:

1. The combination in an incandescent lamp socket, of an insulating base part; a

metallic cylinder, surrounding a part of the base and providing one contact for the lamp, said cylinder having a portion of its periphery clit away; a plate/'curved to lconform `to the curvature of the cylinder mounted on said base part in the cut away portion of the cylinder and spaced at all points from said cylinder; a central lamp contact, within said body part; means, connecting said central contact with the plate; and means,

for the attachment of conductors to the plate and to the cylinder.

2. The combination in an incandescent lamp socket, of an insulating base part; a metallic cylinder, surrounding a part of the base and providing one contact for the lalnp, said cylinder having a portion of its periphery cut away to expose the base part; a plate., curved to conform to the curvature ci the cylinder, mounted on said base part in the cut away portion of the cylinder, and spaced at all points from said cylinder; a central lamp contact, within said body part; means, connecting said central contact with the plate; and strips, cut from said plate and cylinder and bent inwardly to provide conductor-connecting parts.

3. The combination 'in an incandescent lamp socket, of an insulating base part; a metallic cylinder, surrounding a part of the base and providing one contact for the lamp, said cylinder having a portion of its perip plate, curved toconform to the curvature o the cylinder, mounted on said base part in the cut away portion of the cylinder, and spaced at all points from said cylinder; a central lamp contact, within said body part; means, connecting said central contact with the plate; and strips, cut from said plate and cylinder and bent inwardly to provide c onductor-connecting parts, said base part being cut away to receive said inwardly bent strips,

said base part, having openings extendin therethrough and lregistering with the sai conductor connecting parts. Y

4; The combination in an incandescent lamp socket, of an insulating base part; a metalli(` cylinder, surrounding a part of the base and providing one contact for the lamp,- said cylinder having a portion of its periphery cut away; a plate, curved to conform to the curvature o the cylinder mounted on said'base part in the cut awayportion of the cylinder and spaced at allpoints f roin said cylinder; a central lamp contact, within said body part; means, connecting said centrall contact with the plate; means, for the attachment of conductors to the plate and to the cylinder; and an insulating sheath, surrounding saidA cylinder and plate.

In testimony whereof I hereunto set my hand in the presence of two subscribing wit nesses.

VINCENT G. APPLE. In the presence of- E. V. MARTIN, R. HARRY CRONINGER.

. -...Fmi Genies of this patent may he cbtatne for ave cents each, addressing the Commissioner of raient, Washington, t. 

